The Clans was a popular game written for online BBSes back in the day of their great popularity. It is a text-based game featuring inter-BBS communications. It was written initially for Turbo C++, but has been ported to gcc and MSVC

HavokMUD - Havok is a text base MUD written entirely in C. Havok has followed the diku family tree (Diku, Silly, Dale) to become a very modified and unique MUD . Our goal is to create a stable, fun filled, newbie friendly environment.

Prolix is a "binary bot" chat interface
and bot for various battle.net(tm) like
services such as bnetd, fsgs, and possibly
battle.net itself. Prolix offers a modular
design allowing one to create and use
custom controls, bots and displays.

A secure peer-to-peer poker application. Built around a decentralized P2P node/super node network, the system uses multi-party key signing and other distributed and reputable cryptography methods. Transfers are handled through Bitcoin Escrow.

Pysox is an open-source library for the development of isometric, 3D games (RTS and TBS chiefly). It will be scriptable in either Python or Lua. It is written in Objective-C using GNUstep, OpenGL, and SDL.

Revelation is a 3D Engine under the MIT license. It is implemented in C++ with hopes of a embedded LISP dialect. It focuses on quality and design rather than speed. It will be real time when real time catches up with us.